Growth and Yield Response of Soybean (Glycine max L.) In Relation to Temperature, Photoperiod and Sunshine Duration at Anand, Gujarat, India

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1 American-Eurasian Journal of Agronomy (2): 45-5, 28 ISSN X IDOSI Publications, 28 Growth and Yield Response of Soybean (Glycine max L.) In Relation to Temperature, Photoperiod and Sunshine Duration at Anand, Gujarat, India 2 2 Anil Kumar, V. Pandey, A.M. Shekh and Manoj Kumar Birla Institute of Technology, Mesra, Ranchi , India 2 B.A. College of Agriculture, Anand Agriculture University Anand - 388, India Abstract: Three date of sowing with four levels of spacing based on Growing Degree Days (GDD), Heliothermal units (HTU) Photo thermal units (PTU) and Heat use Efficiency (HUE) were obtained for prediction of phenopheses, growth and yield of Soybean. Field experiments were conducted using one cultivar of Soybean (Gujarat Soybean-2/GS-2) during Kharif season of 24 at Anand, Gujarat, (Latitude N, Longitude E and elevation (AMSL) 45. m) India, in sandy soil/sandy loam soil sand percentage (82%) with PH 8.48, bulk density.5 g/cc, soil depth.7 m and number of horizon four. Three dates of sowing (D, D2 and D 3) Leaf area development, Plant Height, Number of pods per plant, number of seed per pod, dry matter accumulation, Stover yield and grain yield were correlated with GDD, HTU and PTU of agro climatic indices -2-2 were observed for early sown soybean. The highest HUE of.83 g m per C day for Stover and.78 g m per C day for grain yield are recorded and GDD directly reflected in dry matter accumulation to soybean as well as Stover yield. Key words: Glycine max Temperature BSS GDD PTU HUE INTRODUCTION formation and maturation are specific stages of development, each affecting all parts of the plant Soybean is considered as the most despised simultaneously. member of oilseeds and pulses in our country. This is Soybean is classified according to form, size, shape probably due to the fact that even under minimum and colour of its seeds and maturity period. The flowers agricultural inputs and management practices it fetches are born on short auxiliary or terminal racemes and there profitable returns to its growers. In recent years, soybean are 8 to 6 flowers in the clusters. The flowers are has assumed important position in India, as it is one of the normally self pollinated and completely self-fertile. The most stable kharif crops yielding cost effective pods of soybean are small either straight flattened or production in varied agro-climatic conditions unlike cylindrical in the shape. In a single inflorescence the kharif pulses and oilseeds of our country. Under number of pod varies from 2 to more than 2 and a plant scientific management conditions soybean cultivation may contain up to 4 pods. yields the highest productivity, net returns and builds up One pod contains normally 2 to 3 seeds. The shape of soil fertility as well. the seeds varies from spherical to flatten discs and the Being a member of legume family, it is capable of colour varies from pale green and yellow to dark brown. meeting its nitrogen requirements from the atmospheric The seed coat is marked with a seed scar that varies in nitrogen through root nodules bacteria thus build up the shape from linear to oval. soil fertility. It is usually erect in the growth habits, bushy and rather leafy. Height of the plant varies from about MATERIALS AND METHODS 4 cm in early type to 2 cm in late maturity types. The branches may be spreading or ascending, short or Field experiment were conducted during Kharif elongated depending on cultivar and growing conditions. season of 24 using commonly sown cultivar GS-2 Soybean is indeterminate in the habit blooming, pod were studied at the Agronomy Research farm of B.A. Corresponding Author: Anil Kumar, Department of Applied Mathematics, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India

2 Am-Euras. J. Agron., (2): 45-5, 28 Collage of Agricultural, Anand Agricultural University, Phenological Phases and Discussion: The study of the Anand, (22 35`N, 72 55`E, 45. m above mean sea level) time pattern associated with the development of the India. Agrometeorological indices like growing degree- different phenophases in the plant as affected by the days (GDD), Heliothermal unit (HTU), photo thermal unit plant environment is called phenology. The development (PTU) and thermal interception rate (TIR), heat use of phenophases are most essential component of the efficiency (HUE) were computed using weather data. The study of crop weather relationship of soybean crop and normal maximum temperature, minimum temperature and crop weather models, which can be used to specify the rainfall during Kharif season at Anand are mm. The most appropriate rate and time of the specific growing degree-days were computed by considering the developmental phases for the maximization of the crop base temperature of. C for the Soybeen crop. The sum yield during the life cycle of soybean in field condition. of the degree days for the completion of each phenophase In the present investigation, the whole life cycle of were obtained by using the following formula. the soybean crop (from the germination of soybean seed to physiological maturity) was sub-divided into 9 distinct ds Accumulated GDD ( C day) = (T Tb) phenological stages, which is shown in the Table. On dh the basis of external morphological characteristics. The Where: occurrence of different phenophases of the soybean crop ( Daily mean air temperature in ) (T max + Tm T C = n) observed in the present study under the three dates of 2 sowing during kharif season in year 24. The number of days taken by the crop for the completion of particular Base Temperature of the Soybean Crop Are C: The phenophases, varied with the date of sowing. The number helio-thermal unit for a given day represents the product of days taken for physiological maturity or the day was of GDD and the actual hours of bright sunshine for 4, 6 and 78, which is shown in the Table and that day. The sum of the HTU for the duration of each graphically presented of phenophases among individual phenophase was determined by using the following days are taken to attained the phase of soybean crop in formula: th th th the Figure when crop sown on 6 June, 26 June and 6 July, 24 respectively. dh Accumulated HTU ( C day) = [(T Tb) i x Di] The result reveal that the number of days taken by ds D sown crop for the maturity was highest (4 days) and were gradually reduced with delay in sowings D 2 The photo thermal unit for a day represents the (6 days) and D 3 (78 days). Delay in the sowing induced product of GDD and the possible sunshine hours the early flowering in the soybean crop, as the day length calculated for Anand, Gujarat, India latitude (22 35 N). increases along with the increasing of the temperature The accumulated of PTU for each phenophase was because of the crop is determinant type with short day determined by the following formula: plant and thermo-sensitive plant and its repose to yield varies with variety of temperature. These results are in dh Accumulated PTU ( C day) = [(T Tbi) x N)] close agreement with the findings of Dhingra et al. []. ds The shortening of the duration of various growth phases in the late sown crop of D 2 and D 3treatment might be the Heat Use Efficiency (Hue): In the similar way that of the probable reason of the reduction in the total biomass APAR use efficiency computation, the heat use efficiency (leaves, stem, pods and roots combined effect). Further, (HUE) was also computed in which periodically measured the variation in the maturity period in all the treatments values of the dry matter data were regressed over the can be explained on the basis of fact that the temperature accumulated growing degree days (GDD) and the slope of was higher in D 2and D 3as compared to D. The decrease straight line was termed as heat use efficiency. in the duration of vegetative period due to prevailing of lower values of maximum temperature and low amount of HUE ( kg ha -per C day) = BY effective rainfall in D 2 and D 3 treatment as compared to GDD D was balanced by the extending of the following period th (27 to 34 Std. Met. Week) due to higher range of Where, BY= Biological yield (seed yield or total biomass), maximum temperatures, higher effective rainfall, GDD= Growing Degree Day higher relative humidity and vapour pressure which 46

3 Am-Euras. J. Agron., (2): 45-5, 28 Table : Number of days (DAS) taken in the different event (phenophases) during the life cycle of soybean crop in the year 24 at Anand Sr. No Phenological stages DAS (D) DAS (D2) DAS (D3) Emergence Unifoliate Flower induction First flower First pod First seed End leaf End pod Physiological maturity DAS (D) DAS (D2) DAS (D3) Linear (DAS (D)) y = 4.5x -.6 R 2 =.987 No. of Days Phenological Phases (P) Fig. : Comparison of number of days taken by soybean crop in different phenophases during life cycle in the year 24 at Anand has reduced the over all differences in the development leaf), P 9 (end of leaf to dough), P (dough to of the phenological phases as compared to D and D 3. physiological maturity). That the accumulated GDD The similar results have also been reported by required for the completion of the crop growth period of Mcnaughton et al. [2]. The decreased in duration of soybean from sowing to maturity in D D 2 and D 3 sown soybean genotype with delay sowing have also been crop was computed. Accumulated GDD value was higher, reported by Dhingra et al. [3], Sharma [4] and which recorded in the first date of sowing crop (D ) as Singh et al.[5]. compared to second date of sowing (D 2) and third date of The results obtained in the present study for the (D 3) sowing soybean crop in the year 24. The value of accumulation of growing degree day (GDD) from date of accumulated GDD was observed in the D, D 2 and D 3 sowing to the completion of the respective phenophases treatments as 73.2, 64.9 and 78.5 C days in the (P ) for the of the crop growth as well as for the entire seasons during completion of P phenophases of respective treatments of kharif in the year 24, over the three dates of sowing soybean crop shown in the Table 2 and also graphically with different combination of treatments. The growing represented Accumulated GDD of three date of sowing degree days was determined on the basis of based (individual treatment) in the Figure 2, during the temperature of C for the soybean crop [6] for the phenophases 8 to maximum value found in case of first different phenophases of crop growth viz., P (Emergence date of sown crop as compared to rest date of sown. to unifoliate), The photo thermal unit (PTU) was also determined of P 2 (First unifolioate to first branching), P (first 3 soybean crop during the year 24 in the kharif season branching to flower bud induction), P 4 (First flower bud and results presented in the Table 2, as well as induction to first flower), P 5 (First flower to 5 per cent graphically plotted in the Figure 3. It revealed that the flower), P 6(5 per cent flower to first pod), P 7(First pod to accumulated PTU ranged from 994 to 7546 C days 5 per cent podding), P (5 per cent podding to end of in the completion of different phenophases (P to P ). 8 47

4 Am-Euras. J. Agron., (2): 45-5, 28 Table 2: Agroclimatic indices (from sowing to physiological maturity) of the soybean cultivars for different treatments during the kharif growing in the year 24 Treatmens Pheno-phases D D D D2 D2 D2 D3 D3 D3 Acc. Acc. Acc. Acc. Acc. Acc. Acc. Acc. Acc. GDD PTU HTU GDD PTU HTU GDD PTU HTU ( Cday P P P P P P P P P P Table 3: Heat use efficiency (HUE) of soybean cultivars GS-2 for the different treatment using the GDD in the year 24 Seed yield Stover yield Acc. GDD HUE of seed with GDD HUE of Stover yield with GDD Treatment (kg ha- ) (kg ha- ) ( C day) (kg ha- per C day) (kg ha- per C day) Date of Sowing D D D Spacing S S S S Accumulated GDD D Accu. GDD (Cday) D2 Accu. GDD (Cday) D3 Accu. GDD (Cday) Linear (D Accu. GDD (Cday)) y = x , R 2 = Phenophases/Stage Fig. 2: Comparison of GDD (from sowing to physiological maturity) of the soybean cultivars for different treatments during the kharif growing in the year 24 48

5 Am-Euras. J. Agron., (2): 45-5, 28 Fig. 3: Comparison of PTU (from sowing to physiological maturity) of the soybean cultivars for different treatments during the kharif growing in the year 24 Accumulated HTU D Accu. HTU (Cday) D3 Accu. HTU (Cday) D2 Accu. HTU (Cday) Power (D Accu. HTU (Cday)) y = 86.3x.4987, R 2 =.623 Fig. 4: Phenophases/Stage Comparison of Accumulated HTU (from sowing to physiological maturity) of the soybean cultivars for different treatments during the kharif growing in the year 24 Fig. 5: Trend line of Heat use efficiency of soybean of gain and Stover yield for response of GDD of different treatment in the year 24 49

6 Am-Euras. J. Agron., (2): 45-5, 28 The accumulated values of the PTU experienced by REFERENCES the crop during P to P phenophases of treatment D (7546 C days), D 2 (943 C days) and D 3 (289 C. Dhingra, K.K., S. Singh and H.P. Tripathi, 98. days) sown crop. Phenological behaviour and yield of pigeonpea The Helio-thermal unit (HTU) was also determined genoty under different dates of sowing and row and the results are presented in the Table 2 and graphical spacings. Proc. of the International Worksnop on presented in the Figure 4. The results revealed that the pigeo7npea, (2): 5-9 Dec., 98. ICRISAT, accumulated helio-thermal unit (Acc. HTU) was ranged Patencheru, A.P., India, pp: from (39 to C days) in the growing period (P to 2. Mcnaughton, H.G., I.J. Warrington and P ) phenophases in all the treatments. The highest value H.L. Turnbulk, 985. The effects of temperature accumulated HTU was recorded (33778 C days) in the and day length on the rate of development of D treatment as compared to the D 3 (628 C days) pigeanpea. Annal Bot., 56(5): treatment for completion of different phenophases 3. Dhingra, K.K., H. Kaur, L.K. Dhaliwal and J. Singh, (P to P ) Photological behaviour and heat unit The heat use efficiency was worked out for the requirement of soybean genotype under different treatment D, D 2 and D 3 sown crop and are presented date of sowing. J. Res. Panjab Agril. Univ., in the Table 3. The study of HUE vs. seed and Stover 32: yield showed that the HUE increased with advancement 4. Sharma, N.N., 994. Response of soybean to sowing of the age of crop. The results also showed that the date in the hill zone of Assam. Ann. Agril. Res., HUE of over all growth period was found more in D2 5: (.78 kg ha C day ) and D 3 (.68 kg ha C day ) 5. Singh, J.N., P.S. Negi and S.K. Tripathi, 974. Effect as compared to D (.29 kg ha C day ) in seed yield. of planting date, plant population and row pacing on It was in ascending in the case of Stover yield. Early the yield and yield characteristics of soybean crop sown crop produced more dry matter and also resulted in Tarai region of Uttar Pradesh. Indian Agric., in higher seed yield and stover than the late sown crop 44: -5. as they availed more growing degree days. Relative 6. Hundal, S.S., H. Singh, P. Kaur and L.K. Dhariwal, lower HUE for the seed yield and Stover yield was 23. Relationship between agro climatic indices. th recorded for the earliest sowing of soybean (6 June) Indian.J. Agric. Sci., 73 (2): as respective treatments are shown in the Figure 5. Heat 7. Balakrishnan, K. and N. Naterajaratanam, 98. use efficiency increased with the delay in sowing for all Influence of sowing dates on the phenology and the treatment combination. The results obtained in the transpiration rate in pigeanpea. Madras Agric. J., present studies are in confirmation with the findings of 74 (3): Balakrishnan and Natarajaratanam [7] for the pigeon pea crop. 5